Chapter 2: Group Consensus
- What are the key chapter elements (take home messages) that I should test you on?
- What new things are you curious about and/or did not fully understand
- What is the coolest thing you learned?
We are on leading edge of the space time continuum

How do you view the timeline of the history of life on Earth?

- Biased towards human existence?
- What processes are key? Is tempo (time between events) important?
- Something non-science based?
- Perspective matters: Understanding the history of biodiversity and critical landmarks in life on Earth help us analyze current changes on Earth.
The Earth is old…and it took a while for life to form.
- Surface was way too hot to start
- cooled enough to make a solid crust
- cooled enough sustain liquid water
- An atmosphere needed to form
- Without an ozone layer, radiation from sun was too intense
- Oxygen needed to accumulate for animals
- Lots of inorganic molecules but no organic molecules
- early atmosphere was reducing

Miller & Urey experiments: Testing Oparin & Haldane


